docs: def get_review_average(obj):
      """Returns the review average for an object."""
      total = 0
      reviews = get_reviews(obj)
      if not reviews:
          return False
      for review in reviews:
          average = review.get_average_rating()
          if average:
              total += review.get_average_rating()
      if total > 0:
          return total / reviews.count()
      return False